Abstract The Carnian Pluvial Episode (CPE) was a dramatic climatic event during the early Late Triassic. The CPE has been recognized worldwide and is marked by the termination of carbonate platform successions and by pronounced negative δ13C excursions (denoted as the CPE excursion). The onset of the CPE has been proposed to be linked with the volatile eruption of the Wrangellia Large Igneous Province (W-LIP). However, this extreme climatic event remains disputed in terms of its precise global correlation, timing of onset, duration, and global magnitude. We compiled a database of 13 conodont biozone-controlled stable-isotope reference sections throughout the Tethyan region. After a reexamination of previously published conodont taxonomy from each section, the statistics on the conodont assemblages/zones yield a global set of 17 high-resolution conodont Unitary Association Zones (UAZs) spanning the entire Carnian successions. A set of age-tie points placed an age model on this global UAZ scale. We added paired δ13Ccarb and δ13Corg data from two sections in South China to other records in this global database, and then normalized all carbon-isotope datasets. A pronounced negative δ13Ccarb excursion with a magnitude of −2± 0.5‰ (from an average of ~3‰ to ~1‰) is evident in these normalized trends and is recognized around the entire Tethys realm. The CPE excursion coincides with conodont UAZ-4 (~234 Ma) through UAZ-8 (within the Mazzaella carnica and Paragondolella praelindae zones, Julian2) and has a duration of ca. 1.5 Myr. We note that an apparent delayed onset of the CPE excursion in South China relative to elsewhere in the Tethys as suggested by previous studies may have been an artifact caused by incomplete conodont-stratigraphic records and/or irregularities in taxonomic identification. A carbon and phosphorus cycle model highlight the strong relationship between the eruption of the W-LIP and CPE excursion; however, the estimated amount of CO2volatiles released by the W-LIP would directly account for only ~25% of the total amount of light‑carbon required to explain the combined magnitude and duration of the global CPE excursion.

中文翻译：

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卡尼阶雨季（晚三叠世）期间由挥发性火山活动和生态系统响应引发的全球碳循环扰动

摘要 卡尼阶雨季是晚三叠世早期的一个戏剧性气候事件。CPE 已在全球范围内得到认可，其标志是碳酸盐台地演替的终止和明显的负 δ13C 偏移（表示为 CPE 偏移）。已提出 CPE 的发生与朗格利亚大火成岩省 (W-LIP) 的剧烈喷发有关。然而，这一极端气候事件在其精确的全球相关性、发生时间、持续时间和全球规模方面仍存在争议。我们编译了整个特提斯地区 13 个牙形石生物区控制的稳定同位素参考部分的数据库。在重新检查了之前发布的每个部分的牙形石分类学之后，牙形石组合/区的统计数据产生了全球 17 个高分辨率牙形石单一关联区 (UAZ)，跨越整个卡尼阶。一组年龄联系点在这个全球 UAZ 尺度上放置了一个年龄模型。我们将来自华南两个部分的成对的 δ13Ccarb 和 δ13Corg 数据添加到该全球数据库的其他记录中，然后对所有碳同位素数据集进行归一化。在这些归一化趋势中，明显的负 δ13Ccarb 偏移为 -2± 0.5‰（从平均约 3‰ 到约 1‰），并且在整个特提斯领域都被识别出来。CPE 游览与牙形石 UAZ-4（~234 Ma）到 UAZ-8（在 Mazzaella carnica 和 Paragondolella praelindae 区域内，Julian2）同时进行，持续时间约为。1.5 密尔 我们注意到，以前的研究表明，相对于特提斯山脉其他地方，华南的 CPE 偏移明显延迟，这可能是由不完整的牙形石地层记录和/或分类学鉴定的不规则性引起的。碳和磷循环模型强调了 W-LIP 喷发与 CPE 偏移之间的密切关系；然而，W-LIP 释放的 CO2 挥发物的估计量仅直接占解释全球 CPE 偏移量和持续时间所需的轻碳总量的约 25%。碳和磷循环模型强调了 W-LIP 喷发与 CPE 偏移之间的密切关系；然而，W-LIP 释放的 CO2 挥发物的估计量仅直接占解释全球 CPE 偏移量和持续时间所需的轻碳总量的约 25%。碳和磷循环模型强调了 W-LIP 喷发与 CPE 偏移之间的密切关系；然而，W-LIP 释放的 CO2 挥发物的估计量仅直接占解释全球 CPE 偏移量和持续时间所需的轻碳总量的约 25%。